1220121210020 has 48 divisors (see below), whose sum is σ = 2597243972400. Its totient is φ = 481419763200.

The previous prime is 1220121210019. The next prime is 1220121210053. The reversal of 1220121210020 is 200121210221.

It can be written as a sum of positive squares in 8 ways, for example, as 95571249316 + 1124549960704 = 309146^2 + 1060448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220121209977 and 1220121210004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579335 + ... + 1666094.

It is an arithmetic number, because the mean of its divisors is an integer number (54109249425).

Almost surely, 2^{1220121210020} is an apocalyptic number.

1220121210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220121210020 is an abundant number, since it is smaller than the sum of its proper divisors (1377122762380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220121210020 is a wasteful number, since it uses less digits than its factorization.

1220121210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245808 (or 2245806 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220121210020 its reverse (200121210221), we get a palindrome (1420242420241).

The spelling of 1220121210020 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, twenty".